Depends what you are trying to achieve and what your budget is. Power FC is great for the money, plus its plug and play so you will save on installation. The downside is that (i believe) it lacks a few safety measures that you would find on a more modern ECU. Ive seen them go for around £700 with a map costing around £500 (ball park, speak to your mapper). If you have more money then you could look at something like Syvecs or Link. I only have Link for reference but by the time youve bought it, had it installed and mapped you are probably looking at more like £2-3k region. So maybe £1k more than PFC.
It comes down to budget really. Its important (as is your choice of mapper) to preserve your engine. So you should spend as much as you can really.
